Bathtub



FIG. 1 is a top plan view of a bathtub showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof, the left side being amirror image of the right side shown;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a bottom plan view thereof; and

FIG. 6 is a perspective view thereof.

The ornamental design for a bathtub, as shown and described.